McKay J A
Remote Sensor Concepts, 3200 Nineteenth Street, N.W., Washington, D.C. 20010-1006, USA.
Appl Opt. 1999 Sep 20;38(27):5859-66. doi: 10.1364/ao.38.005859.
The design of Fabry-Perot etalons for direct detection Doppler wind lidar from a satellite is considered for two direct detection methods, fringe imaging (multichannel) and double edge. The area solid-angle product of the etalon for each technique is derived and shown to be inherently larger, for a given etalon aperture, for the fringe imager than for the double-edge Doppler analyzer. Modeling of the Doppler measurement accuracy of a spaceflight direct detection wind lidar shows that a very large optical aperture, 2 m or more, is necessary. Optical throughput matching to a 2-m collector requires, for the fringe-imaging Doppler analyzer, an etalon with 60 mm aperture, whereas the double-edge technique would require two etalons of 200 mm aperture, or a split-aperture etalon of 400 mm working aperture. Because the two direct detection methods have been shown to have practically identical intrinsic sensitivities (measurement accuracies per unit signal), this difference in etalon dimensions may be a significant selection consideration.
针对两种直接探测方法，即条纹成像（多通道）和双边沿法，对用于卫星直接探测多普勒测风激光雷达的法布里 - 珀罗标准具的设计进行了研究。推导了每种技术标准具的面积立体角乘积，并表明对于给定的标准具孔径，条纹成像仪的该乘积在本质上比双边沿多普勒分析仪的更大。对航天直接探测测风激光雷达的多普勒测量精度进行建模表明，需要非常大的光学孔径，2米或更大。对于条纹成像多普勒分析仪，要使光学通量与2米的收集器匹配，需要一个孔径为60毫米的标准具，而双边沿技术则需要两个孔径为200毫米的标准具，或者一个工作孔径为400毫米的分孔径标准具。由于已表明这两种直接探测方法具有几乎相同的固有灵敏度（每单位信号的测量精度），标准具尺寸的这种差异可能是一个重要的选择考虑因素。
